Keep in mind that the Xbox360 had a full year on the PS3 in terms of release date and these numbers are not accurate as of today... I expect by this winter, the PS3 will overtake the Xbox 360 in terms of numbers both worldwide and North America.
Worldwide sales figures
Wii – 84.64 million as of 31 December 2010[8]
Xbox 360 – 50 million as of 6 January 2011[30]
PlayStation 3 – 47.9 million as of 31 December 2010[31]
Japan sales figures
Wii – 11,534,590 as of 1 April 2011[32]
PlayStation 3 – 6,341,950 as of 1 April 2011[32]
Xbox 360 – 1,448,665 as of 1 April 2011[32]
Europe sales figures
NOTE: Figures include UK sales, which are listed below.
PlayStation 3 – 16 million as of 17 August 2010[33]
United Kingdom sales figures
Wii – 8.3 million as of 1 October 2010[34]
Xbox 360 – 3.9 million as of 13 January 2009[35]
PlayStation 3 - 3 million as of 25 January 2010[36]
United States sales figures
Wii – 30 million as of 10 August 2010[37]
Xbox 360 – 18.6 million as of 31 December 2009[38]
PlayStation 3 - nearly 12 million as of 14 April 2010[39]